Veritasium did a video a few weeks ago about scientists trying to figure out where a space based GPS jamming signal came from. https://www.youtube.com/watch?v=tz23G_UXCGA

I also read the same guerilla advertising for an alternative between the lines. If I understood it correctly from the article, the alternative itself is basically more of the same, but with a stronger signal.

So they basically will launch 300 satellites with an alternative that will face the exact same issues once jamming output signals increase too?

https://app.media.ccc.de/v/39c3-who-cares-about-the-baltic-j... [video]

39C3: "Who cares about the Baltic Jammer?" / "Terrestrial Navigation in the Baltic Sea Region"

First few minutes give a summary, remainder is about DLR's attempt to fix it.

Also, https://gpsjam.org/ (ADS-B data from planes, hence limited coverage area.)

In some parts of the world, it's getting bad. My partner is Lithuanian, and she/we go back there often. They're having a lot of issues there because of Russia.

Near a warzone with consumer hardware? Yes.

Military hardware uses different signals, encryption, more advanced receivers, etc etc, but these things are on ITAR lists and not shared with the public.

It's a little surprising to me that there's a commercial venture that has been allowed to provide these things to the public at some point.